piochtli.

Headword: 
piochtli.
Principal English Translation: 

locks left at the back of the heads of Otomi boys

Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 10 -- The People, No. 14, Part 11, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 177.

Alonso de Molina: 

piochtli. cabellos que dexan enel cogote alos muchachos, quando los tresquilan.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 82r. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

Such boys were called piocheque.
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 10 -- The People, No. 14, Part 11, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 177.